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Chemically-mediated interactions bet...

Runyon, Justin Blake.

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Chemically-mediated interactions between the parasitic plant Cuscuta pentagona, its hosts plants, and insect herbivores.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Chemically-mediated interactions between the parasitic plant Cuscuta pentagona, its hosts plants, and insect herbivores./
Author:	Runyon, Justin Blake.
Description:	143 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-07, Section: B, page: 4019.
Contained By:	Dissertation Abstracts International71-07B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3414364
ISBN:	9781124083322

Chemically-mediated interactions between the parasitic plant Cuscuta pentagona, its hosts plants, and insect herbivores.
Runyon, Justin Blake.

Chemically-mediated interactions between the parasitic plant Cuscuta pentagona, its hosts plants, and insect herbivores. - 143 p.

Source: Dissertation Abstracts International, Volume: 71-07, Section: B, page: 4019.

Thesis (Ph.D.)--The Pennsylvania State University, 2008.

Parasitic plants are some of the world's most destructive agricultural pests and have significant impacts on the dynamics of the communities they inhabit. Yet, the ecology of interactions between parasitic plants and their hosts remain largely unexplored. In this work we investigate the chemical-mediation of interactions between the economically important parasitic plant, Cuscuta pentagona, and its host plants. Cuscuta spp. (dodders) are yellowish vines that lack roots or expanded leaves, and are dependent on aboveground attachment to other plants for water and nutrients. After germination, seedlings must forage and locate a suitable host within a few days in order to survive. We show that location and discrimination of hosts by C. pentagona seedlings is guided by plant volatiles, thus providing a compelling example of volatile communication between plants. We next examined how C. pentagona affected host plant (tomato) defenses against insect herbivores. Parasitism greatly reduced host-plant production of the anti-herbivore phytohormone jasmonic acid (JA) and plant volatiles induced by caterpillar feeding, in part via antagonism of the herbivore- and parasite-induced defense signaling pathways. We also examined the induced responses of tomato to attack by C. pentagona and show that both JA and salicylic acid (SA) defense pathways are sequentially activated. Moreover, these pathways both regulate effective defenses against C. pentagona. Lastly, we review the chemical ecology of seed germination and host location by the major parasitic weeds of crops and discuss the potential for manipulating these mechanisms for sustainable control of these agricultural pests.

ISBN: 9781124083322Subjects--Topical Terms:

1017726
Biology, Ecology.

Chemically-mediated interactions between the parasitic plant Cuscuta pentagona, its hosts plants, and insect herbivores.
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100 1 $a Runyon, Justin Blake. $3 1676094
245 1 0 $a Chemically-mediated interactions between the parasitic plant Cuscuta pentagona, its hosts plants, and insect herbivores.
300 $a 143 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-07, Section: B, page: 4019.
500 $a Advisers: Consuelo M. De Moraes; Mark C. Mescher.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2008.
520 $a Parasitic plants are some of the world's most destructive agricultural pests and have significant impacts on the dynamics of the communities they inhabit. Yet, the ecology of interactions between parasitic plants and their hosts remain largely unexplored. In this work we investigate the chemical-mediation of interactions between the economically important parasitic plant, Cuscuta pentagona, and its host plants. Cuscuta spp. (dodders) are yellowish vines that lack roots or expanded leaves, and are dependent on aboveground attachment to other plants for water and nutrients. After germination, seedlings must forage and locate a suitable host within a few days in order to survive. We show that location and discrimination of hosts by C. pentagona seedlings is guided by plant volatiles, thus providing a compelling example of volatile communication between plants. We next examined how C. pentagona affected host plant (tomato) defenses against insect herbivores. Parasitism greatly reduced host-plant production of the anti-herbivore phytohormone jasmonic acid (JA) and plant volatiles induced by caterpillar feeding, in part via antagonism of the herbivore- and parasite-induced defense signaling pathways. We also examined the induced responses of tomato to attack by C. pentagona and show that both JA and salicylic acid (SA) defense pathways are sequentially activated. Moreover, these pathways both regulate effective defenses against C. pentagona. Lastly, we review the chemical ecology of seed germination and host location by the major parasitic weeds of crops and discuss the potential for manipulating these mechanisms for sustainable control of these agricultural pests.
590 $a School code: 0176.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Entomology. $3 1018619
650 4 $a Biology, Plant Physiology. $3 1017865
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773 0 $t Dissertation Abstracts International $g 71-07B.
790 1 0 $a De Moraes, Consuelo M., $e advisor
790 1 0 $a Mescher, Mark C., $e advisor
790 $a 0176
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3414364